Wood turning lathe



(No Model.) 1 3 sheets-sheet 1.

H. J. OOLBURN.

WOOD TURNING LATHE.

No. 244,741,. I Patented July 26,1881.

Witnesses: I Irwenlpr:

N. FEIERS. Pnaw-Lhm mr. Wnshivlglm 0.6.

(No Model.) I 43 Sheets-Sheet 2.

H. J. COLBURN.

WOIOD TURNING LATHE. No. 244,741. Patented July 26,1881.

(N0 Mod'l.) I l 3 Sheets-Sheet 3. H. J. GOLBURN.

I WOOD TURNING LATHE.

N0 244,741. Patented July 26,1881.

Witnesses: I nvenlor.

Mmazz; fl' w #ZWM Nv PETERS Photo-Lilhognplmr. 'wamm mn. u. I;

f UNITED STATES PATENT OFFICE.

HENRY J. COLBURN, OF FITGHBURG, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TOH. F. GOGGSHALL AND O. F. CROOKER, OF SAME PLACE.

. WOOD-TURNING LATHE.

SPECIFICATION forming part of Letters Patent No. 244,741, dated July 26,1881,

Application filed March I, 1881. (N0 model.)

To all whom it may concern:

Be it known that I, HENRY J. (JOLBURN, of Fitchburg, in the State ofMassachusetts, have invented certain new and useful Improvements inVVood-Turning Lathes, of which thefollowing is a specification. Myinvention relates to that class of woodturning lathes which are providedwith a slid in g tool stock or rest carrying the several tools by whichthe piece of stock is brought to the desired shape; and it consists inpeculiar contrivances forming part of or secured to the tool-stock forholding the tools, and in an improved device for operating said tools.

In the drawings, Figure 1 is a transverse section through the lathe-bedin a plane between the head-stock and the tool-stock, and showing thetool-stock in elevation. Fig. 2 is a rear elevation of the tool-stockremoved from the bed. Fig. 3 is a vertical section on line as m of Fig.2, looking toward the head-stock. Fig. 4 is a section through thedevices for holding and adjusting the cut-01f tool on line y y of Fig.3. Fig. 5 is atransverse section through the roughening-tool holder online 2 z of Figs; 1 and 6 and Fig. 6 is a'longitudinal section of thesame on line 1; o of Figs. 1 and 5. Figs. 4, 5, and 6 are enlargedviews.

Ais the bed of the lathe, provided with guideways a a, upon which thetool-stock or carriage B is mounted, so that it may be'moved along saidbed toward or from the head-stock (not shown) in a well-known manner.The toolstock 13 is provided with an opening, b, in axial line with thespindles ofthe head and tail stocks for the passage of the piece of woodto be operated upon, and has pivoted to its rear or right-hand side thetool-holder 0, provided with the slot 0 and set-screws c 0', arranged toreceive and hold a broad pattern-cutter, O, as shown, or a series ofnarrow cutters of different shapes, according to the design to beturned,all in a well-known manner.

D is a metal bar provided, with the projecting rib cl, and pivoted at bto the inner face of the upright portion of the tool-stock B, andadjustably secured at its outer end by the bolt b passing through theslot 0 as shown in Fig. 3.

Upon the, rib dis fitted the tool-carryin g plate E, the upper edge ofwhich is beveled to receive the inclined portion of the rougheningtoolF, as shown in Fig. 5, and the back orinner face of which tapersslightly from. its center toward either end, as shown in Fig. 6, thatthe said plate may be rocked upon its center in either direction byloosening one of the bolts 6 and tightening the other bolt 6 for theadjustment of the tool. This tool F is firmly clamped to the bevelededge of the plate E by means of the clamping-hook G and the eccentricH,provided with the handle H, said clamp being held in position lengthwiseof the plate E by the boss f, cast on said plate, and projecting intothe vertical slot 9 formed in the clamp Gr, as shown in Figs. 5 and 6.

The cutter G is moved toward the work by means of the soft upholsteredknee-pad I, attached to the elbow-lever J, pivoted at h, and actingthrough the link 41 to turn the disk K, which, in turn, is connected bythe link j to the arm (3 of the 'toolliolder G. The kneepad I is pivotedto the elbow-lever J, and provided with a stop-pin, k, as shown, thismethod ofattachmentpermittingthe knee-pad to move with the operatorsknee without slipping, as it frequently does when the pad is rigidlyattached to the lever J and moved in an are described from the center ofthe pivot h.

L is a bar, carrying at its upper end the cutting-ofl tool M. It has avertical motion in slides L L, which are bolted to the outer face of thetool-stock B, as shown. A stud,m, with which the slotted end of thehorizontal arm of the elbow lever J engages, as shown in Figs.

4 1, '2, and 3, connects the bar L and the link i,

before mentioned. Accordingly an upward movement is also imparted to thecutting-oil tool by the knee-pad I, through the elbow-lever J, aspring,l, carrying the bar L downward in the slides L L, and with it the cutting-off tool M, when the operators knee is removed from the knee-pad. Thebar L has a deep groove, 1, in its inner face, as shown in Fig. 1,'andalso'enlarged in dotted lines in Fig. 4, to receive the cut-off tool Mand permit its adjustment to and from the tool-stock. For the purpose ofthis adjustmenta threaded hole is cut transversely through the barL,near

its upper end, to receive a threaded sleeve, P, through which works aclosely-fitting bolt, N, having a slot, 12, cut transversely through itto receive the cutting-oft tool, which is there held by set-screw O. Thebolt N is provided with a shoulder, 0, and a nut, N. To make theadjustment the sleeve P is turned in either (lirection by means of itsflanged head. The bolt N is fixed in its position relatively to thesleeve P by tightening the nut N, the cutting ofi' tool moving with thebolt.

It is obvious that the cutting-off tool has a longitudinal adjustment asto itself by means of the set-screw O.

The cutting-off tool has the two adjustments above described, and it isessential that it shall have but these two adjustments, since it isobvious that the cutting-edge should always occupy a fixed radialposition relatively to the center of the opening I). The groove 1 in thebar L accordingly prevents the tool from turning in either directionabout the axis of the set-screw O. This fixed radial position of thecutting-edge is, however, liable to be disturbed by cutting away toomuch on one side or the other of the tool when the tool is sharpened;and to prevent this I have on the face of the tool made a mark or lineon the radius required, as indicated upon the tool M by a dotted line inFig. 3, which mark or line serves as a guide for fixing the operatingedge or point.

I claim- 1. In a wood-turning lathe, the elbow-lever J, with knee-pad Ipivoted thereto, and stop k, in combination with a tool-carrier and tooland connecting mechanism, substantially as described, for the purposespecified.

2. The plate E, with suitable devices t'orholding the roughening-tool,and having its lower edge inclined from the middle toward either end, incombination with the adjustable bar D andthe tool-stock, substantiallyas described.

3. The combination of the bar D, the plate E, having its upper edgebeveled and its inner or back side tapered from its middle toward eitherend, the bolts 0 c, clamping-hook G, and eccentric H, all arranged andadapted to operate substantially as described.

4. The combination of the pivoted barD, the tool-stock B, provided withslot a, clamping-bolt b the plate E, having its upper edge beveled andits inner or back side tapered from its middle toward either end, thebolts 0 c, the roughening-tool F, the clamping-hook G, and the eccentricH, substantially as described.

5. The combination of the bar D and the plate E, having its inner orback side beveled from the middle toward either end, with the bolts 0 c,the roughening-tool F, and a clamping device for securing theroughening-tool to the plate E, substantially as described.

6. The grooved bar L, the cutting-oft tool M, the bolt N, provided withthe transverse slot at, the nut N, and shoulder 0, the set-screw O, andthe threaded sleeve P, in combination with the tool-stock B, the tool M,prevented from turning in either direction about the axis of theset-screw 0, but having a longitudinal adjustment to compensate forwear, and a broad side adjustment to and from the toolstock,substantially as described.

H. J. COLBURN.

Witnesses:

W. W. SWAN, H. G. OLMSTED.

